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Search engines get confused when it comes with different content under smae url that means Url or content duplication.
So one should use canonicalization process to fix it up.
Canonical is non-other an attribute (rel=canonical) which provides search engine a proper information of similar url to fix content or Url duplication issues and not to get conflicted with each other.
when should we canonicalize URLs or not?
If the content is extremely similar or exactly duplicate.
Well, if it is the case that the content is either extremely similar or exactly duplicate on two different URLs, two or more URLs, you should always collapse and canonicalize those to a single one.
If the content is serving the same (or nearly the same) searcher intent (even if the KW targets vary somewhat).
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